UID:
kobvindex_GFZ20190730104545
Format:
iii, 54 Seiten
,
Illustrationen
Series Statement:
CRREL Report 89-19
Content:
Recent efforts to improve airborne electromagnetic induction- measurement technology and to downsize the related helicopter-towed antenna assembly from about 7.5 m long to about 3.5 m long for use in airborne measurement of sea ice thickness are discussed, as are the results from arctic field testing. Also outlined are the system noise and drift problems encountered during arctic field evaluation, problems that adversely affected the quality of the sounding data. The sea ice sounding results indicate that it should be possible to determine thickness to within 5% for ice floes with moderate relief but that, because of sounding footprint size and current model algorithm constraints, steepsided pressure ridge keels cannot be well defined. The findings also indicate that routine sea ice thickness profiling from an airborne platform is close at hand with further system improvement, as is the apparent capability to determine the conductivity of the sea ice, from which an assessment of sea ice strength can be made.
Note:
CONTENTS
Abstract
Preface
Introduction
Pre-field-deployment activities
Software development
System optimization
Improvements of the calibration procedure
Real-time processing
Small bird design and implementation
Other improvements
Field activities
Snow, ice and seawater data
AEM surveys
Calibration
AEM data processing
Post-survey results
Processing problem
Ground truth data
Floe freeboard vs thickness analysis
AEM sounding results
Concluding remarks
Literature cited
Appendix A: Blowup of Figure 28
In:
CRREL Report, 89-19
Language:
English
Keywords:
Forschungsbericht
URL:
https://apps.dtic.mil/dtic/tr/fulltext/u2/a224867.pdf
URL:
https://hdl.handle.net/11681/9083
